A one-pot process for the enantioselective synthesis of tetrahydroquinolines and tetrahydroisoquinolines <i>via</i> asymmetric reductive amination (ARA)
作者:Tao Yang、Qin Yin、Guoxian Gu、Xumu Zhang
DOI:10.1039/c8cc03586e
日期:——
Asymmetric reductiveamination for the synthesis of both chiral tetrahydroquinolines (THQs) and tetrahydroisoquinolines (THIQs) has been realized with an Ir/ZhaoPhos catalytic system via a one-pot N-Boc deprotection/intramolecular asymmetric reductiveamination (ARA) sequence. Control experiments reveal that HCl plays a vital role to the success of this transformation. The HCl acid assists the removal
Ir / ZhaoPhos催化体系通过一锅N - Boc脱保护/分子内不对称还原胺化(ARA)序列实现了用于合成手性四氢喹啉(THQs)和四氢异喹啉(THIQs)的不对称还原胺化。对照实验表明,HCl对这种转化的成功起着至关重要的作用。HCl酸有助于除去N- Boc保护基,还提供氯离子与ZhaoPhos中的硫脲部分相互作用,从而实现出色的反应对映控制。
Enantioselective Synthesis of Tetrahydroquinolines from 2-Aminochalcones via a Consecutive One-Pot Reaction Catalyzed by Chiral Phosphoric Acid
作者:Do Young Park、So Young Lee、Jiye Jeon、Cheol-Hong Cheon
DOI:10.1021/acs.joc.8b01709
日期:2018.10.19
A new asymmetric protocol for the synthesis of chiral tetrahydroquinolines from 2-aminochalcones via a two-step one-pot consecutive process (cyclization/asymmetric reduction) has been developed using chiral phosphoric acid as the sole catalyst. 2-Aminochalcones were converted into the corresponding quinolines throughchiral phosphoric acid-catalyzed dehydrative cyclization, and the resultant quinolines
synthesis of chiral tetrahydroquinoline derivatives with excellent enantioselectivities and high yields has been developed through one‐pot cascade biomimetic reduction. The detailed reaction pathway includes the acid‐catalyzed and ruthenium‐catalyzedformation of aromatic quinoline intermediates and biomimetic asymmetric reduction.
Enantioselective Reduction of 3-Substituted Quinolines with a Cyclopentadiene-Based Chiral Brønsted Acid
作者:Weijun Tang、Xiaofang Zhao、Jianliang Xiao
DOI:10.1055/s-0036-1589012
日期:2017.7
Abstract Enantioselective reduction of 3-substituted quinolines has been achieved using a cyclopentadiene-based chiralBrønstedacid as catalyst and Hantzsch ester as hydrogen donor, affording the corresponding tetrahydroquinolines in good enantioselectivities. Enantioselective reduction of 3-substituted quinolines has been achieved using a cyclopentadiene-based chiralBrønstedacid as catalyst and
In buffered water, a broad range of quinoline derivatives underwent asymmetrictransferhydrogenation in air with the rhodium catalyst 1 and sodium formate as the hydrogen source to furnish synthetically important 1,2,3,4‐tetrahydroquinolines with excellent enantioselectivities (see scheme; R=H, Me, F, Cl, Br, OMe; R′=alkyl, aryl).
在缓冲水中,各种各样的喹啉衍生物在空气中以铑催化剂1和甲酸钠作为氢源进行不对称转移加氢,以提供具有重要对映选择性的重要合成1,2,3,4-四氢喹啉(参见方案; R = H,Me,F,Cl,Br,OMe; R'=烷基,芳基)。